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Abstract
Skimmia laureola (Candolle) Siebold & Zucc. ex Walp. is an important traditional medicinal and aromatic plant of India. The leaf and stem essential oils of S. laureola, originated from high altitudes of Indian Himalayan region were analysed using capillary gas chromatography-flame ionization detector (GC-FID) and GC-mass spectrometry (GC-MS). A total of forty-eight constituents, representing 94.9 % of the leaf oil and twenty-six constituents, forming 95.4 % of the stem oil compositions were identified. Major constituents of the oils were linalyl acetate (17.9-44.7 %), linalool (12.5-22.0 %), α-terpinyl acetate (6.2-9.3 %), α-terpineol (5.5-11.1 %), geranyl acetate (4.8-10.6 %), dictamnol (3.9-13.1 %), myrcene (1.1-2.3 %), neryl acetate (2.1-7.1 %), neoiso-dihydrocarveol acetate (0.0-2.0 %) and (2E,6E)-farnesyl acetate (0.2-1.8 %). Leaf and stem derived essential oils were quite different in their compositions. Pregeijerene (C12Chydrocarbon), a commonly reported constituent of S. laureola was not detected in these oils. However, the interesting feature of this oil composition was the presence of dictamnol (Coxygenated hydrocarbon) in higher amount. To the best of our knowledge, dictamnol and 8-epi-dictamnol along with other twenty-one constituents were described for the first time for S. laureola essential oil.